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Please explain how this function is convex and when it will be concave. - Let S=(,0] and consider the function f(x)=xx3 - Then f(x) is

Please explain how this function is convex and when it will be concave.

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- Let S=(,0] and consider the function f(x)=xx3 - Then f(x) is convex on (,0] but not concave

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